My son is one of the two Billboard Onboard singer-pianists on the Eurodam for the next few months -- and from what he says, he and his fellow pianist get along really well and are happy to take requests on music from various decades. He's a pretty wonderful singer (with perfect pitch, so your ears will appreciate it) and his performing partner has many skills as well. People DO sing along and "it's nice," he says, and they try to do a lot of call and response!